Alert archive / Louisiana / Tornado Warnings in 1999

Tornado Warning 81, NWS Shreveport, LA

December 4, 1999Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Dec 4, 1999, 6:23 PM CST for Natchitoches Parish, Louisiana. It was in force for 37 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Dec 4, 1999, 6:23 PM CST (00:23 UTC)
Expired: Dec 4, 1999, 7:00 PM CST
In force: 37 min
Issued by: NWS Shreveport, LA
Area: Whole counties

County Natchitoches Parish, LA

The radar

The Ft Polk radar (KPOE), 64 km from the middle of the area, began a volume at 00:24 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Dec 4, 6:33 PM CST	Tornado F0	Marthaville, LA	Tornado occurred in rural wooded area. Damage consisted of leaf stripped trees and broken branches.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.4 hours before the alert went out and 179 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 50 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1026 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 148 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this tornado warning went out at Dec 4, 3:10 PM CST, 3 hours 13 minutes earlier.

Area forecast discussion, Dec 4, 3:10 PM CST, 3 hours 13 minutes before

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In the hours before

Special weather statement, Dec 4, 3:54 PM CST, 2 hours 29 minutes before

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Special weather statement, Dec 4, 3:54 PM CST, 2 hours 29 minutes before

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Local storm report, Dec 4, 4:35 PM CST, 1 hour 48 minutes before

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Local storm report, Dec 4, 4:35 PM CST, 1 hour 48 minutes before

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Nearby

Tornado Warnings in Louisiana, 1999 Every tornado warning in 1999 Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.